there is also a pressure switch that you can adjust so that the compressor turns on at different pressures. I had to adjust mine after i converted. Now it stays on too long and actually freezes up the evap. and frost blows out the vents. Once it defrosts, its super cold again. Been working great for 2 years now. I did however take the whole system apart, drain the old oil, and flush everything out with a/c flush. But that pressure switch might be set to be on all the time, or set that it cylces too much. Its on the acculmlator, take off the plug and there is a set-screw in there. Just a thought, might work, might not.